EP2138875B1 - Optical fiber connector and optical cable - Google Patents

Optical fiber connector and optical cable Download PDF

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Publication number
EP2138875B1
EP2138875B1 EP08740277A EP08740277A EP2138875B1 EP 2138875 B1 EP2138875 B1 EP 2138875B1 EP 08740277 A EP08740277 A EP 08740277A EP 08740277 A EP08740277 A EP 08740277A EP 2138875 B1 EP2138875 B1 EP 2138875B1
Authority
EP
European Patent Office
Prior art keywords
wedge
section
optical fiber
housing
fiber connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08740277A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2138875A1 (en
EP2138875A4 (en
Inventor
Kenichiro Ohtsuka
Masahiro Hamada
Kouji Niikura
Daizou NISHIOKA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP2138875A1 publication Critical patent/EP2138875A1/en
Publication of EP2138875A4 publication Critical patent/EP2138875A4/en
Application granted granted Critical
Publication of EP2138875B1 publication Critical patent/EP2138875B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3801—Permanent connections, i.e. wherein fibres are kept aligned by mechanical means
    • G02B6/3806—Semi-permanent connections, i.e. wherein the mechanical means keeping the fibres aligned allow for removal of the fibres

Definitions

  • the present invention relates to an optical fiber connector for connecting optical fibers to each other and optical cable.
  • Known as an example of conventional optical fiber connectors is one comprising a lower housing having a V-groove for positioning optical fibers, an upper housing having a pressing section for pressing the optical fibers against the V-groove, and a leaf spring for pressing the lower and upper housings in a state where the V-groove of the lower housing and the pressing section of the upper housing are overlaid on each other as described in.
  • Japanese Patent Application Laid-Open No. 10-170748 Japanese Patent Application Laid-Open No. 10-170748 .
  • JP 10170748 A discloses an optical fiber connector having features equivalent to those in the preamble of Claim 1 below.
  • EP 0 814 353 A1 discloses another fiber optic connector with fiber gripping means useful in understanding the background to the present invention
  • a protrusion of a wedge plate is initially inserted into a wedge insertion hole in an overlapping portion between the lower and upper housings, so as to open the overlapping section, and the optical fibers are inserted into the V-groove in this state. Thereafter, the protrusion of the wedge plate is taken out of the wedge insertion hole, so as to close the lower and upper housings.
  • an optical fiber connector as set out in Claim 1 below.
  • the wedge section of the wedge member When connecting optical fibers together by such optical fiber connector, the wedge section of the wedge member is inserted into the boundary portion between the base section and pressing section of the optical fiber connecting member, so as to open the base section and pressing section from each other, and the optical fibers are butted against each other while being positioned with the base section from both sides of the optical fiber connecting member in this state. Then, the wedge insertion releasing member is pushed against the wedge member, so as to move the wedge member, whereby the wedge section is taken out of the boundary portion between the base section and pressing section. This places the base section and pressing section in a closed state, whereby the optical fibers are secured in the butted state.
  • the optical fiber connector of the present invention is thus provided with the wedge member and wedge insertion releasing member, it is not necessary to prepare a dedicated jig for opening and closing the base section and pressing section each time, aside from the optical fiber connector and optical fibers. Therefore, the optical fibers can easily be assembled to the optical fiber connector.
  • the wedge member is contained in the housing in such a state that the wedge section is inserted beforehand in the boundary portion between the base section and pressing section. This makes it unnecessary for operators to insert the wedge section of the wedge member into the boundary portion between the base section and pressing section of the optical fiber connecting member when connecting optical fibers together by the optical fiber connector, whereby the burden on the operators can be reduced.
  • the housing is provided with a window section for passing therethrough the wedge member in a direction of inserting the wedge section.
  • the wedge member may be pushed in through the window section, whereby the wedge section can be reinserted into the boundary portion between the base section and pressing section.
  • an end part of the housing is provided with a fiber insertion guide for inserting the optical fibers into the optical fiber connecting member
  • the fiber insertion guide has an open section formed on one side face of the housing
  • the wedge member is contained in the housing so as to be located on one of left and right sides of the open section
  • the wedge insertion releasing member is attached to the housing so as to be located on the other of the left and right sides of the open section.
  • the wedge insertion releasing member is integrated with the wedge member. This can reduce the number of components of the optical fiber connector, thereby suppressing its cost.
  • an optical cable as set out in Claim 6 below.
  • the optical fiber connector having the wedge member and wedge insertion releasing member is attached beforehand to a cable end, when connecting optical fibers together by the optical fiber connector, it is sufficient for such optical cable to assemble only an optical fiber to be connected to the optical fiber incorporated in the optical cable to the optical fiber connector, whereby no dedicated jig for opening and closing the base section and pressing section of the optical fiber connecting member is necessary. This allows the optical fiber assembling operation to be carried out easily.
  • the optical fiber connecting member of the optical fiber connector holds an optical fiber exposed at the cable end, while a semisolid refractive index matching material is attached to a leading end of the optical fiber. Since the semisolid refractive index matching material is easy to remain, the refractive index matching property between optical fibers will be secured even if optical fibers are assembled to the optical fiber connector a plurality of times.
  • Embodiments of the present invention allow operations of assembling optical fibers to be performed without preparing dedicated jigs. This can save labors of operators and improve workability.
  • Fig. 1 is a perspective view illustrating a state where optical fibers are assembled to one embodiment of the optical fiber connector in accordance with the present invention
  • Fig. 2 is a horizontal sectional view of the optical fiber connector (including the optical fibers) illustrated in Fig. 1
  • Fig. 3 is a sectional view taken along the line III-III of Fig. 2
  • Fig. 4 is a sectional view taken along the line IV-IV of Fig. 2 .
  • the optical fiber connector 1 in accordance with this embodiment is equipped with a mechanical splice section (optical fiber connecting member) 3, having a substantially rectangular cross section, for mechanically securing and connecting optical fibers 2 to each other.
  • a mechanical splice section optical fiber connecting member 3 having a substantially rectangular cross section, for mechanically securing and connecting optical fibers 2 to each other.
  • the mechanical splice section 3 is constituted by a base plate 5 having a V-groove 4 for positioning the optical fibers 2, a pressing plate 6 for pressing the optical fibers 2 arranged in the V-groove 4 against the base plate 5, and a plurality of (3 here) U-shaped clamping springs 7 for holding the base plate 5 and pressing plate 6 in a vertical stack.
  • a boundary portion between the base plate 5 and pressing plate 6 is provided with a plurality of (4 here) wedge inserting recessed sections 8 into which wedge sections 13 of a wedge member 9 which will be explained later are inserted.
  • opening edge parts of the wedge inserting recessed sections 8 are chamfered.
  • the base plate 5 and pressing plate 6 are held by the clamping springs 7 from the opposite side of the wedge inserting recessed sections 8.
  • the optical fiber connector 1 further comprises the wedge member 9 for opening the base plate 5 and pressing plate 6 of the mechanical splice section 3 from each other, a wedge insertion releasing member 10 for closing the base plate 5 and pressing plate 6, and a housing 11 which has a substantially rectangular cross-sectional form and covers the mechanical splice section 3, wedge member 9, and wedge insertion releasing member 10.
  • the wedge member 9 includes a main body section 12 having a U-shaped cross section and a plurality of (4 here) wedge sections 13 which project from the bottom face of the main body section 12 so as to be inserted into the respective wedge inserting recessed sections 8 of the mechanical splice section 3.
  • the wedge sections 13 are arranged longitudinally of the main body section 12.
  • the leading end part of each wedge section 13 is formed with a taper 13a which cooperates with its corresponding chamfer 8a of the wedge inserting recessed section 8 so as to make it easier for the wedge section 13 to enter the wedge inserting recessed section 8 (see Fig. 3 ).
  • the wedge insertion releasing member 10 includes a planar pressing section 14 and a pair of supportable sections 15 extending in the same direction from both side edges of the pressing section 14.
  • the outer side face of each supportable section 15 is provided with two restraint projections 16 adapted to engage the housing 11.
  • a locking piece 17 adapted to engage the housing 11 is formed at a location between the two restraint projections 16 in each supportable section 15.
  • a locking claw 17a is provided at a leading end part of the locking piece 17.
  • both end parts of the housing 11 are provided with fiber insertion guides 18 for inserting the optical fibers 2 into the mechanical splice section 3.
  • Each fiber insertion guide 18 has an open section 18a opening at the upper face 11 a of the housing 11 and thus is substantially shaped like letter U. Providing the housing 11 with such fiber insertion guides 18 makes it easier to position the optical fibers 2 in the V-groove 4 of the base plate 5.
  • a rectangular window section 19 for passing therethrough a pressing component 24 (see Fig. 11 ) for pushing the wedge member 9 when reinserting the wedge sections 13 of the wedge member 9 into the wedge inserting recessed sections 8 is provided at the center part of one side wall of the housing 11.
  • the other side wall of the housing 11 is formed with a window section 20 for exposing a pressing section 14 of the wedge insertion releasing member 10.
  • Grooves 21 adapted to mate with the restraint projections 16 of the wedge insertion releasing member 10 are formed two by two on the upper and lower sides of the window section 20.
  • Lock receiving holes 22 for receiving the respective locking claws 17a of the locking pieces 17 provided with the wedge insertion releasing member 10 are formed on the upper and lower walls of the housing 11.
  • the upper and lower walls of the housing 11 are provided with stopper claws 23 for preventing the mechanical splice section 3 from escaping more than necessary when the above-mentioned pressing component 24 (see Fig. 11 ) pushes the wedge member 9 into the mechanical splice section 3.
  • the stopper claws 23 are disposed on both longitudinal end sides of the housing 11.
  • the mechanical splice section 3 is contained in the housing 11 such that the pressing plate 6 is positioned on the upper face 11 a (open section 18a) side while the wedge inserting recessed sections 8 face the window section 19.
  • the wedge member 9 is contained in the housing 11 so as to be positioned on the window section 19 side (one of the left and right sides) of the mechanical splice section 3, whereby the main body section 12 of the wedge member 9 can be seen through the window section 19.
  • the wedge member 9 is constructed such that both side faces of the main body section 12 face or come into contact with the upper and lower wall inner faces of the housing 11.
  • the wedge insertion releasing member 10 is contained in the housing 11 so as to be positioned on the window section 20 side (the other of the left and right sides) of the mechanical splice section 3. Specifically, the wedge insertion releasing member 10 is attached to the housing 11 such that each of the restraint projections 16 of the wedge insertion releasing member 10 enter the respective grooves 21 of the housing 11 while each of the locking claws 17a of the wedge insertion releasing member 10 fit into the respective lock receiving holes 22 of the housing 11. As a consequence, the mechanical splice section 3 is mostly covered with the wedge member 9 and wedge insertion releasing member 10.
  • the main body section 12 of the wedge member 9 is arranged such as to oppose the supportable sections 15 of the wedge insertion releasing member 10.
  • each of the restraint projections 16 of the wedge insertion releasing member 10 mate with the respective grooves 21 of the housing 11, whereby the wedge insertion releasing member 10 is prevented from shifting longitudinally of the housing 11. Since the locking pieces 17 of the wedge insertion releasing member 10 latch the housing 11, the wedge insertion releasing member 10 is prevented from dropping out of the housing 11.
  • the optical fibers 2 When connecting two optical fibers 2 by using thus constructed optical fiber connector 1, the optical fibers 2 are initially subjected to a terminating process (cutting, coating removal, and the like). Subsequently, the optical fibers 2 are inserted into the mechanical splice section 3 along the fiber insertion guides 18 of the housing 11 from both sides of the optical fiber connector 1, so as to be positioned in the V-groove 4 of the base plate 5 and butted against each other.
  • a refractive index matching material be disposed between the two optical fibers 2.
  • the pressing section 14 of the wedge insertion releasing member 10 is pushed inward (the arrowed direction of Fig. 10 ), so that the supportable sections 15 of the wedge insertion releasing member 10 push the main body section 12 of the wedge member 9, whereby the wedge sections 13 of the wedge member 9 are taken out of the wedge inserting recessed sections 8 of the mechanical splice section 3 as illustrated in Fig. 3 .
  • the supportable sections 15 move toward the wedge member 9 while elastically deforming the locking pieces 17 along the upper and lower wall inner faces of the housing 11.
  • the pressing section 14 of the wedge insertion releasing member 10 is arranged in a side face section of the housing 11 here, even when an operator holds the optical fiber connector 1 by a hand such that the open sections 18a faces the operator in order for the fiber insertion guides 18 to be seen, for example, a finger of this hand can reach the pressing section 14 and easily push the same.
  • the wedge member 9 and wedge insertion releasing member 10 are contained in the housing 11 as in the foregoing, whereby no wedge jig is required to be inserted into the wedge insertion releasing member 10 for pushing the base plate 5 and pressing plate 6 of the mechanical splice section 3 to open.
  • the optical fibers 2 can be repositioned because they are slightly misaligned from each other, for example, even after having pushed the wedge insertion releasing member 10 so as to take the wedge sections 13 of the wedge member 9 out of the wedge inserting recessed sections 8 of the mechanical splice section 3.
  • the pressing component 24 is pushed against the wedge member 9 through the window section 19, so as to reinsert the wedge sections 13 of the wedge member 9 into the wedge inserting recessed sections 8 of the mechanical splice section 3, thereby pushing the base plate 5 and pressing plate 6 to open from each other. Therefore, the optical fibers 2 can be positioned accurately.
  • Fig. 12 is a sectional view illustrating another embodiment of the optical fiber connector in accordance with the present invention.
  • the optical fiber connector 1 of this embodiment is equipped with a wedge member 31 having a structure in which equivalents of the wedge member 9 and wedge insertion releasing member 10 in the above-mentioned embodiment are integrated.
  • the wedge member 31 is a member for opening and closing the base plate 5 and pressing plate 6 of the mechanical splice section 3.
  • the wedge member 31 includes a wedge base section 32 having an L-shaped cross section, a plurality of wedge sections 33 projecting from the wedge base section 32, a pressing section 34, and supportable sections 35, 36 extending in the same direction respectively from both side edges of the pressing member 34, while the supportable section 35 and the wedge base section 32 are integrated with each other.
  • the wedge section 33 and pressing section 34 have the same structures as those of the wedge section 13 and pressing section 14 mentioned above, respectively.
  • the supportable sections 35, 36 are provided with restraint projections 16 (not depicted) and locking pieces 17 similar to those of the above-mentioned embodiment.
  • the other structures of the optical fiber connector are the same as those of the above-mentioned embodiment.
  • the wedge sections 33 of the wedge member 31 are inserted beforehand in the wedge inserting recesses 8 of the mechanical splice section 3 as illustrated in Fig. 12(a) , whereby the base plate 5 and pressing plate 6 of the mechanical splice section 3 are slightly open from each other.
  • Pushing the pressing section 34 of the wedge member 31 inward moves the wedge member 31 as a whole in the pushing direction, so as to take the wedge sections 33 out of the wedge inserting recessed sections 8 as illustrated in Fig. 12(b) , thereby closing the base plate 5 and pressing plate 6.
  • the mechanical splice section 3 may mostly be covered with the wedge member.
  • Fig. 13 is a perspective view illustrating one embodiment of an optical cable equipped with the optical fiber connector in accordance with the present invention
  • Fig. 14 is a sectional view of the optical cable equipped with the optical fiber connector illustrated in Fig. 13 .
  • the above-mentioned optical fiber connector 1 is attached to a cable end of an optical cable 40.
  • a jacket 41 is removed from an end part of the optical cable 40, so as to expose an optical fiber 42.
  • the optical fiber 42 is positioned in and held by the V-groove 4 of the mechanical splice section 3 in the optical fiber connector 1.
  • the jacket 41 of the cable end part is secured to the housing 11 by securing means (not depicted) such as a blade section (rasp) in one end part of the housing 11.
  • securing means such as a blade section (rasp) in one end part of the housing 11.
  • rasp blade section
  • the optical fiber 2 When connecting the optical fiber 42 incorporated in such optical cable 40 equipped with the optical fiber connector and the optical fiber 2 to each other, the optical fiber 2 is subjected to a terminating process and then positioned in the V-groove 4 of the mechanical splice section 3, so as to butt against the optical fiber 42. Subsequently, the wedge sections 13 of the wedge member 9 are taken out of the wedge inserting recesses 8 of the mechanical splice section 3 by the technique mentioned above. It will be sufficient if only the optical fiber 2 on one side is thus assembled to the optical fiber connector 1, whereby operations of connecting optical fibers on the spot can be carried out easily.
  • a semisolid refractive index matching material S is attached to a leading end part of the optical fiber 41.
  • the refractive index matching material S has a modulus of elasticity of 1 ⁇ 10 4 to 1 ⁇ 10 6 Pa, for example.
  • Such semisolid refractive index matching material S does not flow out like greasy refractive index matching materials and keeps its form over a long period. Therefore, the refractive index matching property between the optical fibers 41, 2 can be secured even when the optical fiber 2 is repeatedly attached to and detached from the optical fiber connector 1.
  • the present invention is not limited to the above-mentioned embodiments.
  • a built-in fiber whose both end faces are mirror-processed may be arranged beforehand in the V-groove 4 of the mechanical splice section 3.
  • Examples of such built-in fiber include those provided with a grating for blocking a specific wavelength of light and those functioning to adjust the mode field diameter (MFD) when connecting optical fibers having different MFDs.
  • the optical fiber connector of the present invention is also applicable to one connecting optical cables to each other, and to connecting multicore optical fibers to each other without being restricted to connecting single-core optical fibers to each other as mentioned above.
  • the present invention provides an optical fiber connector and optical cable by which operations of assembling optical fibers can be performed without preparing dedicated jigs.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
EP08740277A 2007-04-23 2008-04-11 Optical fiber connector and optical cable Not-in-force EP2138875B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007113394A JP5034650B2 (ja) 2007-04-23 2007-04-23 光ファイバ接続器及び光ケーブル
PCT/JP2008/057180 WO2008133048A1 (ja) 2007-04-23 2008-04-11 光ファイバ接続器及び光ケーブル

Publications (3)

Publication Number Publication Date
EP2138875A1 EP2138875A1 (en) 2009-12-30
EP2138875A4 EP2138875A4 (en) 2011-08-03
EP2138875B1 true EP2138875B1 (en) 2013-04-03

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ID=39925507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08740277A Not-in-force EP2138875B1 (en) 2007-04-23 2008-04-11 Optical fiber connector and optical cable

Country Status (10)

Country Link
US (1) US8434948B2 (xx)
EP (1) EP2138875B1 (xx)
JP (1) JP5034650B2 (xx)
CN (1) CN101669054B (xx)
AU (1) AU2008245155B2 (xx)
ES (1) ES2416713T3 (xx)
HK (1) HK1141088A1 (xx)
MY (1) MY148919A (xx)
TW (1) TW200912413A (xx)
WO (1) WO2008133048A1 (xx)

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EP3362833A4 (en) * 2015-10-12 2019-05-22 Corning Research & Development Corporation CONNECTORS FOR CONNECTING TWO NAKED GLASS FIBERS
KR20180096632A (ko) * 2015-12-22 2018-08-29 코베스트로 도이칠란트 아게 기재-안내된 재구성 빔으로 부피 반사 홀로그램을 산업적으로 생산하기 위한 장치 및 방법
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CN108061942A (zh) * 2018-01-26 2018-05-22 浙江中科光电有限公司 一种机械式光纤现场接续装置
CN218782437U (zh) * 2022-11-11 2023-03-31 深圳市中为通讯技术有限公司 一种拼接式sc适配器

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Also Published As

Publication number Publication date
WO2008133048A1 (ja) 2008-11-06
US20100086258A1 (en) 2010-04-08
AU2008245155A1 (en) 2008-11-06
CN101669054B (zh) 2012-01-11
EP2138875A1 (en) 2009-12-30
TW200912413A (en) 2009-03-16
EP2138875A4 (en) 2011-08-03
ES2416713T3 (es) 2013-08-02
MY148919A (en) 2013-06-14
HK1141088A1 (en) 2010-10-29
CN101669054A (zh) 2010-03-10
JP5034650B2 (ja) 2012-09-26
JP2008268674A (ja) 2008-11-06
US8434948B2 (en) 2013-05-07
AU2008245155B2 (en) 2013-02-21

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